Motor-valve mechanism



UNITED STATES l LAWRENCE L. BEDELL, F NORWALK, CONNECTICUT.

MOTOR-VALVE MECHANISM.

Specification of Letters Patent.

Patented Jan. 25, 1921.

Application filed February 5, 1919. Sera-1 No. 275,119.

To all 'whom it' mow concern:

Be it known that I, LAWRENCE L. BEDnLL, a citizen of the United States, and resident of Norwalk, in the county of Fairfield and State olI Connecticut, have invented ceretain new and useful Improvements in Motor- Valve h/lechanism, of which the following is a specification.

My invention relates to valve mechanism 'for gasclene motors and more rparticularly to what I term a valve stem silencer, whereby the noise produced by the operation olz the ordinary inta-ke ot valves is terially decreased.

The object of the invention is to provide means whereby the valve is cushioned in its seating operation so as to reduce the noise and wear, and further to provide such a cushioning and silencing device intermediate of the valve stem and push-rod in a way which will permit of the .application of the innirovements to the usual form of valve mechanism without materially altering the construction, and in away to permit, if desired, the substitution of my said improvement for the valve stem connection now in use upon most of the makes oi' automobile 'gasolenr motorsgto construct the improvement in a simple and practical way so as to not materially add to the expense ot valve mechanism of this sort.

Vitli these and other objects in view the invention resides and consists in the construction and novel combination vand arrangement of parts hereinafter more fully described, illustrated in thel accompanying drawings, and pointed 4out in the claims hereto appended, it `being understood that various changes in the form, proportion, size and minor details of construction within the scope of the claims may be resorted to without departure 'from the spirit or sacriiicing any of the advantages of the invention.

Similar characters of reference denote like or corresponding parts throughout the several figures of the accompanying drawings forming` a part of this specification, and upon which- Figure 1 shovs a central vertical sectional elevation of a gasolene motor valve mechanism including my improvements.

Fig. Q` is a further sectional view in part of the same device, showing the inside construction and illustrating my novel silencing mechanism, and

Fig. 3 is a further sectional view, similar to Fig. 2, but showing the valve, push-rod and intermediate parts in a raised position as inthe opening of the valve.

The valve mechanism to which my improvements are shown applied -in the accompanying drawings is a common and well known type ot construction such as is used upon mostgasolene motors with the exception, possibly, of 4the so-called Silent Knight and includes the associated elements requisite to the operation of the valve and as will be more fully understood from the following description. f

Referring therefore in detail to the relierence characters marked upon the drawings, 5, 6 and 7 represent the several portions of a cylinder block, not shown, in which the valve mechanism is mounted, and timed to be operated in connection with and in respect to the operation of the cylinder pistons, not shown. The particular size, proportions and location of these several portions including the valve seat 8 and intake 9 may obviously vary according to the particular style of cylinders in which the valve mechanism is mounted.

In the drawings, the lower portion serves as a guide or bearing in which the push rod 10 is designed to slidably operate when manipulated by the cam 11 mounted upon the cam shaft 12 ournaled in the bearings 13. The lower end of the push rod is provided with a flat head portion 14E havmg a smooth underiace against which the cam operates to raise the push rod against the action of the spring 15. One end of this spring is seated against the under-side of the portiony 7 ot the cylinder block while the other end is positioned against a disk 16 pinned to the valve stem 17 which is mounted within the spring and to reciprocate in the said bearings 6 and 7 of the cylinder block. The valve 18 mounted upon the upper end ot the valve stem isalso of theV usual construction and includes an annular beveled edge portion which engages the seat lto provide a slight clearance as between the abutting end portions of the two members, that is when the valve is seated and the push rod and the cam are in their eXtreme lower positions, all of which obviously insures the positive seating of the valve. This ccnstruction when so employed permits the valves to close with a bang and chatter which, while not too objectionable in the use ot' a single valve, yet when multiplied by the use of six or eight cylinders, becomes very noisy. Itis this objectionable noise feature of motor valve constructions which I am seeking to overcome and which will be more clearly understood with special reference to Figs. 2 and 3 wherein it will be noted that I have provided a tapped hole 19 in the top end of the push rod to receive my special form of tappet screw 20 which as will be seen includes a threaded shank portion, that is adjustably mounted in the said tappet hole 19, and a shouldered head portion 21 upon the top end having a central pocket therein to freely receive the lower end portion of the valve stem 1T. Upon the threaded shank portion of this tappet screw is mounted a loclrnut which is designed to be seated against the end of the push rod so as to lock the tapped screw in its adjusted position.

The tappet screw further provided with a` central longitudinal hole that alines with the pocket 22 and the center of the valve stem mounted therein. Wvithin the lower end of this hole I provide a ball 2l which is free to turn therein and upon the ball is seated a spring 25; the purpose oi' which is to support the pin 26 mounted upon its top end and within the hole and which is normally pressed against the end of the valve stem by the action of the said spring 25. 'Lne normal position of these parts when the push rod and cam shaft are down and the valve closed in substantially that shown in F ig. 2 which shows a slight clearance 2T as between the lower end oi the, valve stem and the bottom of the pocket and which serves the usual purpose of insuring the closing of the valve by the action of the spring 15 when the push rod and cam are down. The pin and its spring when in this position serving no special function except perhaps to tend to hold the push rod down upon the cam.

The open position oi the valve is shown in Fig. 3 and in this view it will be seen that the spring is slightly compresesd, and the pin 21 shoved down so that the valve stem is positively seated against the bottom of the pocket 22 forming a positive and rigid connection between the push rod and valve stem during what might be termed the upward stroke of the cam. On the other had, when the cam throws over its center and the push rod and valve stem descend, then the tendency of the spring 25 and its pin is to slightly separate the end of the valve stem from the bottom of the pocket in the tappet screw and in that way form a cushion for the seating of the valve so that the same will come down quieter yet positively and efficiently.

Having thus described my invention, what l claim and desire to secure by Letters Patent, is

In a motor valve mechanism of the class described, the combination of a push rod having a threaded socket in the upper end, an adjustable tappet screw threaded therein and having a cylindrical recess at the upper end, a valve and stem whose free end is guided in the recess and in substantial frio tional contact with the walls thereof, a spring-pressed pin mounted in the tappet screw recess in engagement with the valve stem, and a locked nut threaded on the tappet screw and engaging the push rod for holding the tappet screw in adjusted positions relatively to the push'rod, the length of the recess in the tappet screw being sufficient to guide the valve stem in its axial movements.

Signed at Bridgeport, in the county of Fairfield and State of Connecticut, this 31st day of January, A. D. 1919.

LAVVREN CE L. BEDELL. Witnesses C. M. NEWMAN, LILLIAN M. ALLING. 

